Atmospheric rivers (ARs) are long, narrow bands of intense water vapor transport that move large amounts of moisture from low to mid latitudes, resembling giant rivers in the sky. They are gaining widespread attention because of their potential to trigger flooding across the Japanese archipelago. Researchers at University of Tsukuba have discovered that influenced by global warming and the strengthening of the North Pacific Subtropical High, the intensity of water vapor transport in ARs has increased by approximately 8% over the past 42 years (1981-2022).

We have developed a method for making simultaneous soft X-ray absorption spectroscopy (XAS) measurements of solid-liquid interfaces and bulk liquids. By controlling the thickness of the liquid layer, we obtained the O K-edge XAS spectrum of bulk H₂O from a liquid H₂O layer on a thin Au film using the transmission method, and we used the electron-yield method to obtain the XAS spectrum of the H₂O/Au interface by measuring the drain currents from the Au surface following soft X-ray absorption. This method for obtaining simultaneous XAS measurements of solid-liquid interfaces and bulk liquids can be utilized to investigate the mechanisms of a variety of catalytic, electrochemical, and biological reactions involving solid-liquid interfaces.

A research team led by University of Tsukuba has revealed that the severity of Japanese winters is strongly influenced by the combined behavior of two distant climate systems: atmospheric circulation over the North Atlantic-European region and convective activity in the tropical Indo-Pacific. When these systems align, they reinforce each other and intensify cold conditions in Japan; when they are misaligned, their influence weakens, leading to milder impacts.

Arctic communities are increasingly exposed to dangerous weather events due to climate change and rely on accurate weather forecasts. However, conditions in the lower atmosphere remain poorly observed in the Arctic because monitoring systems are expensive and difficult to deploy. Now, researchers propose a new framework for on-demand atmospheric observations based on lightweight, low-cost profiling systems that can be operated by local communities whenever additional weather data are needed, helping improve forecasting and climate resilience.

You have gone without food for days, and the temperature drops to near freezing. What do you do? For some animals, the answer is influenced by the brain’s circadian clock. Hummingbirds, bats, and mice are among the animals that can enter torpor, which reduces body temperature and metabolism. Scientists suspected that the brain’s circadian clock controls the timing of torpor, but until now the exact mechanism was not known. Researchers at Nagoya University in Japan have identified the specific neural circuit responsible for this survival strategy. They have shown that the brain’s circadian clock, a small cluster of neurons located in the hypothalamus at the base of the brain, sends silencing signals through this circuit to a nearby temperature-regulating region, suppressing torpor during the day. The findings were published in Nature Communications. 

Kyoto, Japan -- As climate change alters the temperatures of animal habitats, it seems natural that endotherms, warm-blooded animals like us, would prefer to hang out in the shade during hot weather. The use of microhabitats in the sun and shade is an important thermoregulatory behavior that has been reported across a wide range of animal species, and researchers are becoming increasingly interested in how animals -- especially those with long lifespans -- flexibly cope with thermal stress.

Japanese macaques, sometimes colloquially called snow monkeys, reside further north than any other non-human primates, and also have the highest hair density, which may make it difficult for them to dissipate heat. While observing some macaques in the field, a researcher at Kyoto University noticed that some of them appeared to choose resting sites that were neither fully sunny, nor fully shaded.

"That observation led me to wonder whether semi-shade might play a more meaningful role in thermoregulation than previously recognized," says corresponding author Yoshiyuki Tabuse.

For the first time, researchers, including those from the University of Tokyo, found out how to determine how much carbon dioxide (CO2) from either natural or anthropogenic sources can be absorbed by special concrete production methods. This can be useful for economic tools such as carbon trading and carbon accounting, and the work could lead to similar measurement techniques for other gases of concern. 

The Nankai Trough just off southern Japan poses a severe seismic threat, with locked plates accumulating enormous stress. A new dataset from the Japan Coast Guard offers an unprecedentedly detailed look into the variability of this locking state over a ten-year period, contributing to understanding of the seismology of this hazardous plate boundary and to disaster preparedness, representing a significant step forward in subduction zone risk monitoring.